"4am every day until 1pm the next day" is 37 hours if you take it literally. Mathematically this obviously can't be true. Your interpretation of "4am until 1pm

"4am every day until 1pm the next day" is 37 hours if you take it literally. Mathematically this obviously can't be true. Your interpretation of "4am until 1pm the same day" is only one of many possible ways we could "fix" the sentence to mean something sensible.